Hydraulic lifting jack



w. J. COOPER HYDRAULIC LIFTING JACK Flled March 14 1924 mm U A WQ March 2 1926.

March 2 1926; 1,575,039

w. J. COOPER HYDRAULIC LIFTING JACK Filed March 14, 1924 2 Sheets-Sheet 2 Patented Mar. 2, 1926.

UNITED STATES 1,575,039 PATENT OFFICE.

WALTER J. COOPER, OF CLEVELAND, OHIO, ASSGNOR TO EDWARD UMBSTAETTER,

' OF CLEVELAND, OHIO.

HYDRAULIC LIFIING JACK.

Application led March 14, 1924. Serial No. 699,176.

To all ywhom t may concern.'

Be it known that WALTER J. Coornn, a citizen of the United States, residing at Cleveland, in the county of VCuyahoga and State of Ohio, has invented certain new and use- -ful Improvements in a Hydraulic Lifting Jack, of which the following is a speciication.

My invention relates to a hydraulic lifting jack, and my object in general is to provide a portable jack in which an operating plunger is adapted to be quickly and conveniently placed in different angular operating positions relatively to a vertical lifting member, thereby permitting the jack to be placed in crowded quarters beneath the objcct and to be operated from different angles where most accessibleand convenient. The jack .is especially useful as a vehicle jack, as it may be used beneath the body or axle relatively close to the wheels or other obstructions and still readilyaccessible for operation from many diierent angles, and very heavy loads ma be easilylited with a relatively small jac Other objects are featured in the details of construction as will hereinafter be pointed out and described.

In the accompanying drawings, Fig. 1 is a side elevation of the jack, and Fig. 2 is a side view, partly in section, showing the operating plunger and its cylinder in a slightly inclined position. in full lines and in still another inclined position in dotted lines. Fig. 3 is a horizontal section of the jack on line 3-3 of Fig. 1. Fig. 4 is a side elevation of the lifting plunger. Fig. 5 is a perspective view of the stationary screw for the operating ram or plunger. Fig. 6 is a top view of the swivel member for the operating plunger, showing the locking pin and outlet port in the bottom thereof. Fig. 7 is a side view of the portion of a modified form of the invention.

The jack comprises a Hat base 2 adapted to support a round hollow cylinder 3 in an upright position and in open communication with a central hollow boss 4 upon said base. Lateral bosses 5-5 extend from opposite sides of central boss 4 and these bosses are bored to receive the round hollow stem 6 of a swivel member 7 which has an annular flanged enlargement 8 ada ted to support a hollow cylinder 9 within w ich an assemably and operably co ed. A screw plug 1() closes the outer end of one of the bosses 5 and a ring nut or packing gland 11 is sleeved upon swivel stem 6 and screw-engaged with the other boss 5. Stem 6 has a longitudinal passage 12 with av round port 13 opening into hollow boss 4 and the bottom end of stationary cylitler 3, and a round duct 14 also extends from passage v12 through enlargement 8 into the base end of the movable cylinder 9. This open passageway between the two cylinders is constantly maintained in all the swiveled positions assumed by movable cylinder 9 and its swivel stem 6.

Stationary cylinder 3 contains a kreciprocable plunger 15 which is free to slide therein within limits as determined by a shoulder or enlargement 16 at its upper end and by a metal disk 17 screwed or bolted to its lowei.`

end. Plunger 15 and its disk`17 is of smaller' c diameter than the internal diameter ofhollow cylinder 3, and a screw collar 18 may be used to secure the plunger in place and provide a bearing for its movement through the upper end of cylinder 3. A packing gland or nut 19 may also be used in connection with collar 18 to seal the joint around the plunger. The upper end of plunger 3 may be provided with athrust or rest member 2O of any suitable kind or construction to carry the load.

Cylinder 9, which is movable in an arc at the side oi stationary cylinder', contains a stationary screw member 21 and a rotatable screw member 22. Member 21 comprises a hollow stem provided with external screwthreads, andv member 22 is a tube with internal screw threads engaged with said screw stem, the latter having an enlargement or base-part 23 adapted to seat snugly within the lianged and recessed enlargement 8 of swivel member 7. A round pin 24 fixed within the recess is adapted to enter a round hole 25 in base port 23 to prevent the screw stem or member 22 from turning. When so fixed 'a notch 26 in base part 23 registers with duct 14 in swivel member 7 and the oil or liquid within the jack may be transferred from one cylinder to the other by the movement of the plungers. Thus the rotatable screw member 22 may be rotated within cylinder 9 by means of a crank or operating shaft applied to the square or angular projection 27 at its outer exposed end, and in so doing tubular member 22 travels longitudinally of the screw stem in either direction dependent upon the direc-V tion 'oit rotation given. A screw collar 28 supplemented by a closely fitting sealing ring or nut 29 provides a bearii'ig and closure at the outer end oit cylinder 9 lor the tubular screw member or operating plunger 22. The chamber within tubular member 22 is open to the central bore in the stationary screw member 2l, and a lateral opening 30 at the lower end of the hollow screw stem is open to the chamber within cylinder 9 and which chamber Vis in turn in constant open com mnnieation with the transfer passage in the swivel member by way of notch 26 and duct 14;

In operating the jack, it may be placed in an upright position beneath an axle of a vehicle closely adjacent a wheel, and the n'iovable cyli-nder turned to the most desirable ang-le whichl will give access toJ the operati-ng plunger and facilitate operations. Screw plunger 22 may then be rotated to displace the oil, grease or liquid within c ylinder 9 and to transfer it to stationary cylinder 3 whereli-t will act to raise lift member or plunger 1K5 and the load. A reversal of rotation et screw plunger 22 will permit a reverse'illow o't the liuidi within the cylinders and permit the li'lt plunger to descend. The swiveled-v cylinder may be turnedv to an upright position or to the le-'ft or right to a horizontal position. Stationary screw member'2l is clamped upon swivel member 7 by means of cylinder 9, and by unscrewing said cylinder both the stationary and movable screw members 21 and 22 may be bodily removed and separated. In filling the cylinder with oil or other fluid it is necessary that no airbe pocketed Within the cylinders, and therefore, I provide plunger 22 with a small oriiiee and valve seat 32 at its outer end Jfor the escape of air and also provide a screw 33 with a pointed end to engage the seat and close this orilice when the device is iilled and in use.

In Fig. 7, I show the same swivel member 7 ot the jack connected with the base at one side olz stationary cylinder '3 and with a communicating passage at the bottom thereot. The device may be made in this way to permit the use olf a longer chamber or a more extended travel of a plunger in either cylinder, applying the comparison to the two structures shown herein.

I claim as my invention or discovery:

l'. A hydraulic lift jack, comprising` a pair of cylinders having a swiveled coupling provided with a passage for the transfer ot a .Fluid from one cylinder to the other, operating and litt plungers in said cylinders, the operating plunger being a rotatable hollow screwthreaded member, a stationary hollow screw member extending into said operating plunger having a disk-shaped base and formed with an opening near said base and the cylinder for the operatingplunger' being` screwed in clamping engagement with said base to hold said screw member in a stationary and removable position upon said coupling.

2. A hydraulic lift jack, comprising a pair ot cylinders in swiveled connection and in open eonnnunieation 'for the transfer olf a Vfluid trom oneto the other cylinder and plungers in the cylinders; the operating plunger in one cylinder comprising a hol low screw member, and formed with a slotted disk-shaped base having an opening, and a seat for said base havingy a pin and an opening registering with the opening and slot, respectively, in said base.

In testimony whereof I ai'IiX my name hereto. Y

lVAL'l-ER J. COOPER. 

